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Old 7th August 2019, 11:35 AM   #1
flamethrower1 is offline flamethrower1  United States
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Just ordered the boards to build this amp.
Doing research on initial set up, I have found all the answers I need on setting bias thanks to all of the great info posted by others, thanks.
I can not however find anything on adjusting the center pot.
Can anybody point me in the right direction.
Please forgive me if this sounds like a noob question,this is my first amplifier build.

Thanks, Greg
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Old 7th August 2019, 12:26 PM   #2
nr12 is offline nr12  Germany
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You mean P3? See page 7 in the article.
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Old 7th August 2019, 12:33 PM   #3
Dennis Hui is offline Dennis Hui  Canada
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F5 V3
One really should have some way of measuring distortion to adjust P3. If not,
I recommend just leaving it at the midpoint position.

This thread should give you idea of what P3 adjustment is about.

Adjusting P3 - a video

Dennis
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Old 7th August 2019, 03:21 PM   #4
McQuaide is offline McQuaide  United States
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You can just omit P3 unless you are going to use a distortion analyzer.
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Old 7th August 2019, 11:12 PM   #5
flamethrower1 is offline flamethrower1  United States
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F5 V3
I appreciate the guidance from you guys, thanks.
Nr12, what article are you referring to.
I have been doing a lot of research and reading and have not found a reference to adjusting P3.
Maybe I missed something
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Old 8th August 2019, 03:19 AM   #6
BluesTM is offline BluesTM  United States
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I thought P3 was like used for AC balance. If you didn't have a distortion analyzer could you use a scope to get a balanced signal at the output?
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Old 8th August 2019, 03:50 AM   #7
nr12 is offline nr12  Germany
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Hi flamethrower1,

I refer to Nelsons article about the F5 Turbo. The basis of all threads. You should have read it in the beginning.

Best regards,
Ulf
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Old 8th August 2019, 12:28 PM   #8
flamethrower1 is offline flamethrower1  United States
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Yeah, I actually did read that article some time ago and read it again last night.
Thanks
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Old 9th August 2019, 06:43 PM   #9
McQuaide is offline McQuaide  United States
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Here's 6L6's video about P3 adjustment on a BA-3.


BA-3 Amplifier illustrated build guide
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Old 17th August 2019, 10:00 PM   #10
flamethrower1 is offline flamethrower1  United States
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F5 V3
I have all my parts ordered for the F5 boards.
Getting ready to order the parts for the DIY PSU.
I am planning on using the Antek 4218 transformer.
I have seen other posts that recommend going to 15K CAPS VS the 10K, anyone have some real life experience between the two?
Also, the input snubber and resistor combo, here is what I have found
Antek 400VA, 18v

Cx 10nF
Cs 150nF
Rs 18.3Ω

Antek AS-4218 with Cx=10nf Cs=150nf and Rs=6-10Ω. I'm using 7Ω in my actual circuit

Antek AS-4218, 400VA, dual 18V secondaries, dual full wave bridges:
(Attributed to another DIYer who requested to not use his name.)



Cx = 3.3nf
Cs = 470nf
Rs = 16.9 ohms
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